<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
  <style>
    html, body {
      margin: 0;
      padding: 0;
      width: 100%;
      height: 100%;
    }

  </style>
</head>
<body>
  <img src="{{ qr_code_url }}" width="320" height="320" alt="QR code">
</body>
</html>
